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Heat Exchanger Design - Essential HE 1. Establish design criteria and engineering analysis requirements to assess if guillotine fracture is credible based on the following: The mechanical properties of the materials of construction used in heat exchanger tubes, baffles, etc. Degradation of the materials through corrosion or erosion. Minimum tube thickness specification required to prevent guillotine fracture. Vibration analysis to ensure that the likelihood of guillotine fracture is minimised. Sensitivity analysis of process variations which should be carried out as part of the engineering analysis to ensure that the design is robust, e.g. flow, pressure, temperature etc. Gathering industry heat exchanger data.

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Heat Exchanger Design - Essential HE 2. Establish design criteria that determine when transient effects need to be considered for overpressure protection of STHEs: Determine if differential pressure limits can be established below which transient effects from a tube rupture can be ignored. Determine the maximum allowable transient overpressures (peak pressure and duration) in the shell, under tube rupture conditions, below which fast acting pressure relief is not required. Extend the University of Sheffield work on heat exchanger stress distribution. HE 3. Determine the impact of transient loads on the piping systems if bursting disks are not applied for overpressure and develop appropriate design guidelines to ensure that the piping design is robust but not overly conservative.

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Relief Device Selection - Essential RD 1. Conduct shock tube tests at the same scale as typical relief device sizes encountered in real applications to establish the response times under a range of overpressures (150-400%). RD 2. Establish mechanical integrity criteria for relief valves for use in tube rupture service. RD 3. Establish the range of process conditions for which conventional relief valves could be utilised to protect against tube rupture and those for which bursting disks are required. This needs to consider aspects such as differential design pressure between low and high pressure side of exchanger, relief device speed of response etc. Alternate relief valve types and manufacturers’ products will be taken into account.